Chapter 10 Install and System Administration for FortiOS 5.0 : VLANs : Example VLAN configuration in NAT mode : Test the configuration
  
Test the configuration
Use diagnostic commands, such as tracert, to test traffic routed through the FortiGate unit and the Cisco switch.
See Also
Testing traffic from VLAN_100 to VLAN_200
Testing traffic from VLAN_200 to the external network